How to handle a week of overeating?

Hi everyone, I'm a girl who struggle with body mage OCD and, in less way because i'm followed by a nutritionist, dating disorders. So I go to the Gym about 4 times a week and follow an average diet of 900/1200 kcal. This week i split completely: i didn't exercise all the week long and increase a bit the calorie amount of food. Plus, There have been also 2 days of binge eating: in the first i ate 3 slices of Pandoro, a kind of italian Christmas sponge cake, with a whole Mikado box. In the second day I finished the week with 17 slices of pizza (thin, tho). I feel so bad about myself and miss the body i had a week ago. How much time does It take to burn the fat i put on? How can i avoid to feel guilty and depressed?